Abstract: Hermetic container provided with an upper opening having a longitudinal axis and surrounded by a first folded edge coaxial to the longitudinal axis; and a closing assembly of the upper opening comprising a cap and a connector element; the connector element having a second folded edge coaxial to the longitudinal axis arranged in contact with the first folded edge and an external thread; the cap having an internal thread for screw type coupling with the external thread of the connector element; the closing assembly comprises an adapter which is coaxial to the longitudinal axis and has a third edge folded on the first edge with the interposition of the connector element so as to obtain a reinforced rim.